add_library(MathFunctions SHARED mysqrt.cxx)
target_include_directories(MathFunctions
        INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}
        )

# does this system provide the log and exp functions?
include(CheckCXXSourceCompiles)
check_cxx_source_compiles("
  #include <cmath>
  int main() {
    std::log(1.0);
    return 0;
  }
" HAVE_LOG)
check_cxx_source_compiles("
  #include <cmath>
  int main() {
    std::exp(1.0);
    return 0;
  }
" HAVE_EXP)

if(HAVE_LOG AND HAVE_EXP)
    target_compile_definitions(MathFunctions
            PRIVATE "HAVE_LOG" "HAVE_EXP")
endif()

install(TARGETS MathFunctions DESTINATION lib)
install(FILES MathFunctions.h DESTINATION include)
set_target_properties(MathFunctions PROPERTIES INSTALL_RPATH $ORIGIN/../lib)